Staff Sgt. Robert Thorell, 22nd Maintenance Squadron nondestructive inspection craftsman, uses a black light to inspect an aircraft part May 26, 2020, at McConnell Air Force Base, Kansas. NDI Airmen dip equipment in a phosphorus chemical and illuminate it with a black light to identify hairline cracks that would be undetectable under regular lightning conditions. (U.S. Air Force photo by Senior Airman Alexi Bosarge)